Accession Number:

ADA021506

Title:

Distance-Amplitude Relationships for Long-Period P, S, and LR from Measurements on Recordings of the Long-Period Experimental Stations

Descriptive Note:

Technical rept.

Corporate Author:

TELEDYNE GEOTECH ALEXANDRIA VA SEISMIC DATA ANALYSIS CENTER

Personal Author(s):

• Von Seggern, D. H.

Report Date:

1975-09-24

Pagination or Media Count:

26.0

Abstract:

Measurements on long-period P, S, and LR phases were extracted from an eight-month data base for nine stations of the Long Period Experimental network. Amplitude-distance curves were plotted for P and S from shallow-focus events these curves generally agreed with the commonly-used Gutenberg-Richter B factors. The amplitude-distance curve for LR was different in slope than the commonly-used correction curve for M sub S however, this difference would not be sufficient to affect routine network M sub S estimates by more than roughly . 1 magnitude unit. The Q for 20-second LR implied by this new data is roughly 700, in contrast to the 300 implied by the accepted amplitude-distance curve.

Descriptors:

• *RAYLEIGH WAVES
• *SEISMIC WAVES
• *SEISMOGRAPHS
• AMPLITUDE
• ATTENUATION
• CURVE FITTING
• DIFFRACTION
• MEASUREMENT
• RANGE(DISTANCE)
• SEISMOLOGICAL STATIONS
• TIME

Subject Categories:

• Seismology
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE